Effects of microstructure on the adiabatic shearing behaviors of titanium alloy

The effects of microstructure on the adiabatic shearing behaviors in the Ti-1300 alloy were investigated by means of the split Hopkinson pressure bar (SHPB) with hat-shaped specimens. Shear bands were developed in both Ti-1300 alloys withi beta phase and alpha +beta lamellar microstructures during a forced dynamic shear deformation. The microstructures have a significant influence on the adiabatic shearing behaviors of Ti-1300 alloy. The critical strain for the initiation of shear bands in alpha+beta lamellar microstructure is less than that in beta phase microstructure. The alpha + beta lamellar microstructure experiences more extensive microscopic damage than beta phase microstructure. Therefore, the alpha + beta lamellar microstructure is more susceptive to adiabatic shear localization deformation than beta phase microstructure at the same strain rate. (C) 2010 Elsevier B.V. All rights reserved.